Examples with Assertions.checkNotNull com.google.android.exoplayer2.util.Assertions.checkNotNull used on opensource projects

Example 76 with Assertions.checkNotNull

use of com.google.android.exoplayer2.util.Assertions.checkNotNull in project ExoPlayer by google.

the class MergingMediaPeriod method selectTracks.

@Override
public long selectTracks(@NullableType ExoTrackSelection[] selections, boolean[] mayRetainStreamFlags, @NullableType SampleStream[] streams, boolean[] streamResetFlags, long positionUs) {
    // Map each selection and stream onto a child period index.
    int[] streamChildIndices = new int[selections.length];
    int[] selectionChildIndices = new int[selections.length];
    for (int i = 0; i < selections.length; i++) {
        Integer streamChildIndex = streams[i] == null ? null : streamPeriodIndices.get(streams[i]);
        streamChildIndices[i] = streamChildIndex == null ? C.INDEX_UNSET : streamChildIndex;
        selectionChildIndices[i] = C.INDEX_UNSET;
        if (selections[i] != null) {
            TrackGroup mergedTrackGroup = selections[i].getTrackGroup();
            TrackGroup childTrackGroup = checkNotNull(childTrackGroupByMergedTrackGroup.get(mergedTrackGroup));
            for (int j = 0; j < periods.length; j++) {
                if (periods[j].getTrackGroups().indexOf(childTrackGroup) != C.INDEX_UNSET) {
                    selectionChildIndices[i] = j;
                    break;
                }
            }
        }
    }
    streamPeriodIndices.clear();
    // Select tracks for each child, copying the resulting streams back into a new streams array.
    @NullableType SampleStream[] newStreams = new SampleStream[selections.length];
    @NullableType SampleStream[] childStreams = new SampleStream[selections.length];
    @NullableType ExoTrackSelection[] childSelections = new ExoTrackSelection[selections.length];
    ArrayList<MediaPeriod> enabledPeriodsList = new ArrayList<>(periods.length);
    for (int i = 0; i < periods.length; i++) {
        for (int j = 0; j < selections.length; j++) {
            childStreams[j] = streamChildIndices[j] == i ? streams[j] : null;
            if (selectionChildIndices[j] == i) {
                ExoTrackSelection mergedTrackSelection = checkNotNull(selections[j]);
                TrackGroup mergedTrackGroup = mergedTrackSelection.getTrackGroup();
                TrackGroup childTrackGroup = checkNotNull(childTrackGroupByMergedTrackGroup.get(mergedTrackGroup));
                childSelections[j] = new ForwardingTrackSelection(mergedTrackSelection, childTrackGroup);
            } else {
                childSelections[j] = null;
            }
        }
        long selectPositionUs = periods[i].selectTracks(childSelections, mayRetainStreamFlags, childStreams, streamResetFlags, positionUs);
        if (i == 0) {
            positionUs = selectPositionUs;
        } else if (selectPositionUs != positionUs) {
            throw new IllegalStateException("Children enabled at different positions.");
        }
        boolean periodEnabled = false;
        for (int j = 0; j < selections.length; j++) {
            if (selectionChildIndices[j] == i) {
                // Assert that the child provided a stream for the selection.
                SampleStream childStream = Assertions.checkNotNull(childStreams[j]);
                newStreams[j] = childStreams[j];
                periodEnabled = true;
                streamPeriodIndices.put(childStream, i);
            } else if (streamChildIndices[j] == i) {
                // Assert that the child cleared any previous stream.
                Assertions.checkState(childStreams[j] == null);
            }
        }
        if (periodEnabled) {
            enabledPeriodsList.add(periods[i]);
        }
    }
    // Copy the new streams back into the streams array.
    System.arraycopy(newStreams, 0, streams, 0, newStreams.length);
    // Update the local state.
    enabledPeriods = enabledPeriodsList.toArray(new MediaPeriod[0]);
    compositeSequenceableLoader = compositeSequenceableLoaderFactory.createCompositeSequenceableLoader(enabledPeriods);
    return positionUs;
}